210121210219 has 4 divisors (see below), whose sum is σ = 210145088296. Its totient is φ = 210097332144.

The previous prime is 210121210151. The next prime is 210121210223. The reversal of 210121210219 is 912012121012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210121210219 is a prime.

It is a super-2 number, since 2×210121210219² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210121210219.

It is not an unprimeable number, because it can be changed into a prime (210121210249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11925834 + ... + 11943439.

It is an arithmetic number, because the mean of its divisors is an integer number (52536272074).

Almost surely, 2^210121210219 is an apocalyptic number.

210121210219 is a deficient number, since it is larger than the sum of its proper divisors (23878077).

210121210219 is an equidigital number, since it uses as much as digits as its factorization.

210121210219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23878076.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 210121210219 in words is "two hundred ten billion, one hundred twenty-one million, two hundred ten thousand, two hundred nineteen".